Quick-Charging Line Y-Capacitor Layout for EV Noise Isolation
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Solution Overview
Problem
The quick-charging line for electric vehicles lacks a noise countermeasure, leading to potential noise interference from circuits like DC/DC converters during quick charging.
Innovation Solution
Incorporating a quick-charging line with a first noise filter, such as Y capacitors, connected between noise-generating components and the quick-charging system to eliminate noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a quick-charging line is used to supply large DC power to the storage battery, then charging speed is improved, but noise from circuits like DC/DC converters flows into the quick-charging system
Solution Approach 1:
A common ground line is introduced as an intermediary connection between the noise-generating circuit (DC/DC converter) and the quick-charging system. This common ground line provides a dedicated return path for noise currents, preventing them from flowing into the quick-charging system while maintaining the high-speed charging function.
Solution Approach 2:
The noise elimination function is extracted as a separate concern from the quick-charging line. By providing a dedicated common ground line specifically for noise current return, the noise path is separated from the power transmission path, allowing the quick-charging line to focus on efficient power delivery without being contaminated by noise currents.
2Object-generated harmful factors
If a noise filter is added to the quick-charging line, then noise elimination is improved, but device complexity increases
Solution Approach 1:
The common ground line serves as a simple intermediary structure that eliminates noise without requiring complex filtering components. By establishing a dedicated return path for noise currents through this intermediate ground connection, the system achieves noise elimination using basic electrical connection principles rather than complex active or passive filters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces noise interference in the quick-charging system, preventing noise from noise-generating components from flowing into the system.
Implementation Method 1
a Y capacitor that eliminates noise
Implementation Method 2
a first noise filter that is disposed on the quick-charging line and eliminates noise
Data Source
AI summary
Provided are a charging device and a vehicle capable of reducing the amount of noise flowing into a quick-charging facility. The pair of charging lines connecting the quick-charging facility (20) to an onboard battery (30) are referred to as quick-charging lines, and each of these quick-charging lines is provided with a relay (16-1, 16-2). Each relay (16-1, 16-2) is used to switch the current flowing in the respective quick-charging line on and off, the current being switched on during quick-charge and being switched off during normal charging. Each quick-charging line has a Y-capacitor (17) connected thereto closer to a QC port (15) than the respective relay (16-1, 16-2).